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arrayformat.rs
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154 lines (147 loc) · 4.68 KB
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// Copyright 2014-2016 bluss and ndarray developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fmt;
use super::{
ArrayBase,
Data,
Dimension,
};
use dimension::IntoDimension;
fn format_array<A, S, D, F>(view: &ArrayBase<S, D>, f: &mut fmt::Formatter,
mut format: F)
-> fmt::Result
where F: FnMut(&A, &mut fmt::Formatter) -> fmt::Result,
D: Dimension,
S: Data<Elem=A>,
{
let ndim = view.dim.slice().len();
/* private nowadays
if ndim > 0 && f.width.is_none() {
f.width = Some(4)
}
*/
// None will be an empty iter.
let mut last_index = match view.dim.first_index() {
None => view.dim.clone(),
Some(ix) => ix,
};
for _ in 0..ndim {
try!(write!(f, "["));
}
let mut first = true;
// Simply use the indexed iterator, and take the index wraparounds
// as cues for when to add []'s and how many to add.
for (index, elt) in view.indexed_iter() {
let index = index.into_dimension();
let take_n = if ndim == 0 { 1 } else { ndim - 1 };
let mut update_index = false;
for (i, (a, b)) in index.slice()
.iter()
.take(take_n)
.zip(last_index.slice().iter())
.enumerate() {
if a != b {
// New row.
// # of ['s needed
let n = ndim - i - 1;
for _ in 0..n {
try!(write!(f, "]"));
}
try!(write!(f, ","));
if !f.alternate() {
try!(write!(f, "\n"));
}
for _ in 0..ndim - n {
try!(write!(f, " "));
}
for _ in 0..n {
try!(write!(f, "["));
}
first = true;
update_index = true;
break;
}
}
if !first {
try!(write!(f, ", "));
}
first = false;
try!(format(elt, f));
if update_index {
last_index = index;
}
}
for _ in 0..ndim {
try!(write!(f, "]"));
}
Ok(())
}
// NOTE: We can impl other fmt traits here
/// Format the array using `Display` and apply the formatting parameters used
/// to each element.
///
/// The array is shown in multiline style, unless the alternate form
/// is used, `{:#}`.
impl<'a, A: fmt::Display, S, D: Dimension> fmt::Display for ArrayBase<S, D>
where S: Data<Elem=A>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
format_array(self, f, <_>::fmt)
}
}
/// Format the array using `Debug` and apply the formatting parameters used
/// to each element.
///
/// The array is shown in multiline style, unless the alternate form
/// is used, `{:#?}`.
impl<'a, A: fmt::Debug, S, D: Dimension> fmt::Debug for ArrayBase<S, D>
where S: Data<Elem=A>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// Add extra information for Debug
try!(format_array(self, f, <_>::fmt));
try!(write!(f, " shape={:?}, strides={:?}", self.shape(), self.strides()));
Ok(())
}
}
/// Format the array using `LowerExp` and apply the formatting parameters used
/// to each element.
///
/// The array is shown in multiline style, unless the alternate form
/// is used, `{:#e}`.
impl<'a, A: fmt::LowerExp, S, D: Dimension> fmt::LowerExp for ArrayBase<S, D>
where S: Data<Elem=A>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
format_array(self, f, <_>::fmt)
}
}
/// Format the array using `UpperExp` and apply the formatting parameters used
/// to each element.
///
/// The array is shown in multiline style, unless the alternate form
/// is used, `{:#E}`.
impl<'a, A: fmt::UpperExp, S, D: Dimension> fmt::UpperExp for ArrayBase<S, D>
where S: Data<Elem=A>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
format_array(self, f, <_>::fmt)
}
}
/// Format the array using `LowerHex` and apply the formatting parameters used
/// to each element.
///
/// The array is shown in multiline style, unless the alternate form
/// is used, `{:#x}`.
impl<'a, A: fmt::LowerHex, S, D: Dimension> fmt::LowerHex for ArrayBase<S, D>
where S: Data<Elem=A>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
format_array(self, f, <_>::fmt)
}
}